Ngā pātai tauira mō te whakawhiti

23 Ngā tauira o ngā pātai mō ngā whakawhiti hiko Ngā whakawhiti hiko

1. He koiri tuatahi, he koiri tuarua hoki kei roto i tētahi whakawhiti hiko, e 500 me te 5000 ngā hurihanga, e hono ana ki tētahi whatunga iahiko whakawhiti 220 V. He aha te tegangan te putanga?

A. 220 ngaohiko

B. 1.100 ngā hiko

C. 2.200 ngā hiko

D. 22.000 ngā hiko

Kōrero

E mōhiotia ana:

Koiri tuatahi (N_P) = 500 pōkai

Koiri tuarua (N_s) = 5000 pōkai

Ngaohiko tuatahi (V_P) = 220 Ngāohiko

I pātaihia: Ngaohiko tuarua (V_S)

Whakautu:

Tātai whakawhiti:

V_s / N_s =V_p / N_p

V_s / 5000 = 220 / 500

V_s / 5000 = 0,44

V_s = (0,44)(5000)

V_s = 2.200 Ngā Waohiko

Ko te whakautu tika ko C.

2. Ko te mahi a te whakawhiti hiko he...

A. te hurihanga o te ngaohiko me te mana

B. te whakarerekē i te ngaohiko o te au hurihuri

C. te kaiwhakahaere hiko o te au tika

D. hanga te au tika hei au hurihuri

Kōrero

Ko te mahi a ngā whakawhiti hiko he whakarerekē i te ngaohiko o te au hiko hurihuri (AC). E rua ngā momo whakawhiti hiko: ko ngā whakawhiti hiko piki-ake me ngā whakawhiti hiko heke-ake. Ka whakanui ake ngā whakawhiti hiko piki-ake, ko ngā whakawhiti hiko heke-ake ia ka whakaiti i te ngaohiko.

Ko te whakautu tika ko B.

3. I roto i tētahi whakawhiti hiko, he koiri tuatahi e 1200 ngā hurihanga, ā, he koiri tuarua e 1000 ngā hurihanga. Mēnā ko te iahiko tuatahi he 4 A, ko te kaha o te iahiko tuarua ko...

A. 2 Āpere

B. 3 Āpere

C. 4 Āmpere

D. 4,8 Āmpere

Kōrero

E mōhiotia ana:

Koiri tuatahi (N_P) = 1200 takahuri

Koiri tuarua (N_S) = 1000 takahuri

Te kaha o te au tuatahi (I_P) = 4 Āmpere

I pātaihia: Te kaha o te au tuarua (I_S)

Whakautu:

Ko te tātai whakawhiti hiko e whakaatu ana i te whanaungatanga i waenga i te maha o ngā hurihanga koiri (N) me te iahiko hiko (I) ko:

I_S/I_P = N_P/N_S

Ko te kaha o te au tuarua ko:

I_S/ 4 = 1200/ 1000

I_S/ 4 = 1,2

I_S = 1,2 (4)

I_S = 4,8 Āmpere

Ko te whakautu tika ko D.

4. I te hoahoa i tētahi whakawhiti hiko, hei whakaputa i tētahi ngaohiko tuarua o te 220 volts mai i tētahi ngaohiko tuatahi o te 110 volts, ko te ōwehenga o te maha o ngā takahuri tuarua ki ngā takahuri tuatahi ko...

A. 2 : 3

B. 3 : 2

C. 6 : l2

D. 12 : 6

Kōrero

E mōhiotia ana:

Ngaohiko tuarua (V_S) = 220 Ngāohiko

Ngaohiko tuatahi (V_P) = 110 Ngāohiko

I pātaihia : Te ōwehenga o te maha o ngā takahuri tuarua ki te maha o ngā takahuri tuatahi (N_S/N_P)

Whakautu:

Ko te tātai whakawhiti hiko e whakaatu ana i te whanaungatanga i waenga i te ngaohiko hiko me te maha o ngā hurihanga koiri ko:

V_S/V_P = N_S/N_P

220/110 = N_S/N_P

22/11 = N_S/N_P

2/1 = N_S/N_P

12/6 = N_S/N_P

Ko te whakautu tika ko D.

5. Tirohia te ahua o te whakawhiti hiko i raro nei!

Ko te ngaohiko matua o te whakawhiti hiko ko…

A. 24 Ngā Waohiko

B. 240 Ngā Waohiko

C. 264 Ngā Waohiko

D. 340 Ngā Waohiko

Kōrero

E mōhiotia ana:

Ngaohiko tuarua (V_S) = 24 Ngāohiko

Te takai tuatahi (N)_P rānei N₁) = 11 N

Te takai tuarua (N_S ranei N₂) = 1 N = N

I pātaihia: Ngaohiko tuatahi (V_P)

Whakautu:

Tātai whakawhiti:

V_s / N_s =V_p / N_p

Ka tatauhia te ngaohiko tuatahi mā te whakamahi i te tātai i runga ake nei:

V_s / N_s =V_p / N_p

24 / N = V_p / 11 N

24 / 1 = V_p / 11

24 = V_p / 11

V_p = (24)(11)

V_p = 264 Ngā Waohiko

Ko te whakautu tika ko C.

6. Tirohia te ahua i raro nei! Ko te rahi o te ngaohiko whakauru o te whakawhiti hiko ko...

A. 140 Ngā Waohiko

B. 180 Ngā Waohiko

C. 630 Ngā Waohiko

D. 720 Ngā Waohiko

Kōrero

E mōhiotia ana:

Te takai tuatahi (N)₁) = 21 N

Te takai tuarua (N₂) = 3 N

Ngaohiko tuarua (V₂) = 20 Ngā Waohiko

I pātaihia: Ngaohiko tuatahi (V₁)

Whakautu:

Tātai whakawhiti:

V₂ / N₂ =V₁ / N₁

Ka tatauhia te ngaohiko tuatahi mā te whakamahi i te tātai i runga ake nei:

20 / 3N = V₁ / 21N

20 / 1 = V₁ / 7

20 = V₁ / 7

V₁ = (7)(20)

V₁ = 140 Ngā Waohiko

Ko te whakautu tika ko A.

7. Ko ngā āhuatanga e whai ake nei o tētahi whakawhiti hiko whakarunga-whakaara...

A. He nui ake te ngaohiko tuatahi i te ngaohiko tuarua

B. He iti iho te maha o ngā koiri tuatahi i te maha o ngā koiri tuarua.

C. He iti ake te iahiko i roto i te pōkai tuatahi i te iahiko i roto i te pōkai tuarua.

D. He nui ake te mana o te pōkai tuarua i te mana o te pōkai tuatahi.

Kōrero

He taputapu te whakawhiti hiko e huri ana i te ngaohiko o te au hurihuri ki te au hurihuri. E rua ngā momo o ngā whakawhiti hiko: whakawhiti hiko-whakapiki dan whakawhiti hiko-iho.

Ko te mahi a te whakawhiti hiko whakarunga he whakanui ake i te ngaohiko hiko kia nui ake te ngaohiko tuarua i te ngaohiko tuatahi; ko te mahi a te whakawhiti hiko whakararo he whakaiti i te ngaohiko hiko kia iti ake te ngaohiko tuarua i te ngaohiko tuatahi.

I roto i te whakawhiti hiko whakarunga, he nui ake te maha o ngā hurihanga o te pōro tuarua i te maha o ngā hurihanga o te pōro tuatahi; i roto hoki i te whakawhiti hiko whakararo, he iti iho te maha o ngā hurihanga o te pōro tuarua i te maha o ngā hurihanga o te pōro tuatahi.

Ko te whakautu tika ko B.

8. Ko ngā āhuatanga o te whakawhiti hiko whakarunga ko...

A. he nui ake te ngaohiko tuatahi i te ngaohiko tuarua

B. he nui ake ngā takai tuatahi i ngā takai tuarua

C. he iti ake te ngaohiko tuatahi i te ngaohiko tuarua

D. He rite tonu te takai tuatahi ki te takai tuarua

Kōrero

He taputapu te whakawhiti hiko hei huri i te ngaohiko o te au hiko tauutuutu (AC). E rua ngā momo whakawhiti hiko: ko ngā whakawhiti hiko piki-ake me ngā whakawhiti hiko heke-ake. Ka whakanui ake ngā whakawhiti hiko piki-ake, ko ngā whakawhiti hiko heke-ake ia ka whakaiti i te ngaohiko.

Ko ngā āhuatanga o te whakawhiti hiko whakarunga:

– He iti ake te ngaohiko tuatahi, he nui ake te ngaohiko tuarua

– he iti ake ngā tahuritanga tuatahi, he nui ake ngā tahuritanga tuarua

Ko ngā āhuatanga o tētahi whakawhiti hiko whakaheke-whakaheke ko:

– He nui ake te ngaohiko tuatahi, he iti ake te ngaohiko tuarua

– he nui ake ngā tahuritanga tuatahi, he iti ake ngā tahuritanga tuarua

Ko te whakautu tika ko C.

9. Tirohia te hoahoa whakawhiti hiko e whai ake nei!

Ko te maha o ngā takahuri tuarua o te whakawhiti hiko ko….

A. 550 ngā takahuri

B. 1.000 ngā hurihanga

C. 2.000 ngā hurihanga

D. 10.000 ngā hurihanga

Kōrero

E mōhiotia ana:

Ngaohiko tuatahi (V_P) = 220 Ngāohiko

Te takai tuatahi (N)_P) = 200 takahuri

Ngaohiko tuarua (V_S) = 1100 Ngāohiko

I pātaihia: Te takai tuarua (N_S)

Whakautu:

Tātai whakawhiti:

V_s / N_s =V_p / N_p

Ka tatauhia te maha o ngā takahuri tuarua mā te whakamahi i te tātai i runga ake nei:

V_s / N_s =V_p / N_p

1100 Ngā Waohiko / N_s = 220 Volts / 200 takahuri

1100 / N_s = 220/200

1100 / N_s = 1,1

N_s = 1100/1,1

N_s = 1000 ngā takahuri

Ko te whakautu tika ko B.

10. Tirohia te hoahoa whakawhiti hiko e whai ake nei!

Ko te maha o ngā takahuri tuarua o te whakawhiti hiko he…

A. 550 ngā takahuri

B. 1.000 ngā hurihanga

C. 2.000 ngā hurihanga

D. 10.000 ngā hurihanga

Kōrero

E mōhiotia ana:

Ngaohiko tuatahi (V_P) = 220 Ngāohiko

Te takai tuatahi (N)_P) = 200 takahuri

Ngaohiko tuarua (V_S) = 1100 Ngāohiko

I pātaihia: Te takai tuarua (N_S)

Whakautu:

Ko te tātai whakawhiti e whakaatu ana i te whanaungatanga i waenga i te ngaohiko me te maha o ngā hurihanga ko:

V_s / N_s =V_p / N_p

Ka tatauhia te takai tuarua mā te whakamahi i te tātai i runga ake nei:

V_s / N_s =V_p / N_p

1100 / N_S = 220/200

1100 / N_S = 22/20

1100 / N_S = 1,1

N_S = 1100/1,1

N_S = 1000

Ko te maha o ngā takahuri tuarua he 1000 takahuri.

Ko te whakautu tika ko B.

11. Kia aro ki ngā raraunga whakawhiti hiko e whai ake nei!

I runga i ngā raraunga o runga ake nei, ka taea te whakatau ko…

Kōrero

He taputapu te whakawhiti hiko e mahi ana hei whakanui, hei whakaiti rānei i te ngaohiko o te hiko AC (aukume whakawhiti). Ko te whakawhiti hiko e mahi ana hei whakanui i te ngaohiko ka kiia he whakawhiti hiko. taahiraa-ake ā, ko te whakawhiti hiko e mahi ana ki te whakaiti i te ngaohiko ka kiia he whakawhiti hiko takahanga-iho.
E rua ngā koiri waea o te whakawhiti hiko, arā, ko te koiri tuatahi (N) me te koiri tuarua (N)._P) me te koiri tuarua (N_SI runga i te whakawhiti hiko taahiraa-akeN_S nui atu i te N_PI runga i te whakawhiti hiko takahanga-ihoN_S iti iho i te N_PWhakawhitiwhiti taahiraa-ake ka whakanui ake i te ngaohiko, nō reira ka iti ake te ngaohiko hiko i roto i te koiri tuatahi, ā, ka nui ake te ngaohiko hiko i roto i te koiri tuarua. I tetahi atu taha, ko te whakawhiti hiko takahanga-iho te whakaheke i te ngaohiko kia nui ake ai te ngaohiko hiko i runga i te koiri tuatahi, kia iti ake ai hoki te ngaohiko hiko i runga i te koiri tuarua.
He whakawhiti te Whakawhiti A takahanga-iho ā, he whakawhiti hiko B taahiraa-ake.
Ko te whakautu tika ko C.

12. Tirohia te ahua o te whakawhiti hiko e whai ake nei!

Mai i ngā kōrero o te ahua i runga ake nei, ko te kōrero tika mō te ahua 1 me te ahua 2 ko…

A. He whakawhiti hiko whakarunga te Pikitia 1, ā, he whakawhiti hiko whakararo te Pikitia 2.
B. He whakawhiti hiko whakaheke te Pikitia 1, ā, he whakawhiti hiko whakarunga te Pikitia 2
C. Ko ngā Pikitia 1 me te 2 he whakawhiti hiko whakaheke
D. Ko ngā Pikitia 1 me te 2 he whakawhiti hiko whakarunga.

Kōrero
I runga i te whakawhiti taahiraa-ake (whakakaha hiko), he iti ake te hiko tuatahi, he nui ake te hiko tuarua. I roto i te whakawhiti hiko takahanga-iho (whakaiti ngaohiko), he nui ake te ngaohiko tuatahi, he iti ake te ngaohiko tuarua.
He nui ake te ngaohiko tuatahi o te whakawhiti hiko i te Pikitia 1 i te ngaohiko tuarua (20 V > 5 V) nō reira he whakawhiti hiko. takahanga-ihoHe iti ake te ngaohiko tuatahi o te whakawhiti hiko i te ahua 2 i te ngaohiko tuarua (5 V < 40 V) nō reira he whakawhiti hiko. taahiraa-ake.
Ko te whakautu tika ko B.

13. Tirohia te whakaahua e whai ake nei o tētahi whakawhiti hiko!

Mai i te whakaahua i runga ake nei, ko te kōrero tika ko…
A. Whakawhiti I = whakawhiti whakaheke, nā te mea ko N_s > N_p
B. Whakawhiti I = whakawhiti piki-ake, nā te mea ko V_s <V_p
C. Whakawhiti II = whakawhiti whakaheke, nā te mea ko V_p <V_s
D. Whakawhitiwhiti II = whakawhitiwhiti whakaneke, nā te mea ko N_p < N_s
Kōrero
He whakawhiti te Whakawhiti I takahanga-iho nā te mea ko V_p > V_s me Np > Ns.
He whakawhiti te Whakawhiti II taahiraa-ake nā te mea ko V_p <V_s me N_p < N_s.
Ko te whakautu tika ko D.

14. Kia tupato ki te hoahoa whakawhiti hiko e whai ake nei!
Mena ko te maha o ngā takahuri koiri he N₁ = 100 ngā takahuri me te N₂ = 250 takahuri, ngaohiko V₂ ko….

A. 100 Ngā Waohiko
B. 150 Ngā Waohiko
C. 200 Ngā Waohiko
D. 250 Ngā Waohiko

Kōrero

E mōhiotia ana:
Ngaohiko tuatahi = V_p =V₁ = 40 Ngā Waohiko
Koiri tuatahi = N_p = N₁ = 100 ngā takahuri
Koiri tuarua = N_s = N₂ = 250 ngā takahuri
Pātai: Ngaohiko tuarua = V_s =V₂
Whakautu:

Tātai whakawhiti:
V_s / N_s =V_p / N_p
Ngaohiko tuarua:
V_s / N_s =V_p / N_p
V_s / 250 = 40 / 100
V_s / 250 = 4 / 10
V_s / 250 = 0,4
V_s = (0,4)(250)
V_s = 100 Ngā Waohiko
Ko te whakautu tika ko A.

15.

Ko te hoahoa e whai ake nei o tētahi whakawhiti hiko mōtini tino pai me ōna raraunga. Mena ko te iahiko e rere ana i roto i te ātete R he 4 Amperes, ko te iahiko e rere ana i roto i te koiri tuatahi ko….

A. 0,8 A
B. 1,6 A
C. 5,0 A
D. 20 A

Kōrero
E mōhiotia ana:
Koiri tuatahi = N_p = N₁ = 600 ngā takahuri
Iahiko tuarua = I_s = Ahau₂ = 4 Āmpere
Koiri tuarua = N_s = N₂ = 120 ngā takahuri
Pātai: Iahiko tuatahi = I_p = Ahau₁
Whakautu:
Tātai whakawhiti:
I_P N_p = Ahau_s N_s
Te kaha o te au matua:
I_P N_p = Ahau_s N_s
I_P (600) = (4)(120)
I_P (600) = 480
I_P (60) = 48
I_P = 48/60
I_p = 0,8 Āmpere
Ko te whakautu tika ko A.

16.
Tirohia te pikitia e whai ake nei!
I roto i te hoahoa whakawhiti hiko e whai ake nei, ko te iahiko tuatahi ko….
A. 0,1 A
B. 0,2 A
C. 0,8 A
D. 1,6 A
Kōrero
E mōhiotia ana:
Ngaohiko tuatahi = V_p =V₁ = 100 Ngā Waohiko
Ngaohiko tuarua = V_s =V₂ = 50 Ngā Waohiko
Iahiko tuarua = I_s = Ahau₂ = 0,4 Āmpere
Pātai: Iahiko tuatahi = I_p = Ahau₁
Whakautu:
Tātai whakawhiti:
V_P I_p =V_s I_s
Te kaha o te au matua:
V_P I_p =V_s I_s
(100) ahau_p = (50)(0,4)
(100) ahau_p = 20
I_p = 20/100
I_p = 0,2 Āmpere
Ko te whakautu tika ko B.

17. Tirohia te ripanga ine ngaohiko me te iahiko mō te whakawhiti hiko tino pai i raro nei!
E ai ki te ripanga i runga ake nei, ko ngā uara R me P ko…

A. R = 600 Volts; P = 30 takahuri
B. R = 200 Volts; P = 30 hurihanga
C. R = 60 Volts; P = 40 takahuri
D. R = 20 Volts; P = 40 takahuri
E. R = 10 Volts; P = 20 takahuri

Kōrero

Tātai whakawhiti
V_s N_p = N_s V_p  me V_p I_p =V_s I_s
Ngā Mōhiohio:
V_s = ngaohiko tuarua, V_p = ngaohiko tuatahi, N_s = takai tuarua, N_p = te takai tuatahi_, I_p = te kaha o te au tuatahi, I_s = te kaha o te au tuarua
Ngaohiko tuatahi (V_p)
V_p I_p =V_s I_s
V_p (4) = (10)(80)
V_p = 800/4
V_p = R = 200 Ngāohiko
Te takai tuarua (N_s)
V_s N_p = N_s V_p
(10)(600) = N_s (200)
6000 = 200 N_s
N_s = 6000/200
N_s = P = 30 ngā takahuri
Ko te whakautu tika ko B.

18. E whakaatu ana te ripanga e whai ake nei i ngā raraunga mō ngā whakawhiti hiko pai e rua.
I runga i ngā raraunga o te ripanga i runga ake nei, ko ngā uara o K me L ko…

A. K = 1 A me L = 20 Volts
B. K = 2 A me L = 30 Volts
C. K = 3 A me L = 40 Volts
D. K = 4,5 A me L = 53 Volts
E. K = 5 A me L = 30 Volts

Kōrero
Whakamahia tētahi o ngā tātai whakawhiti hiko hei whakatau i te ia tuarua o te whakawhiti hiko 1 me te ngaohiko tuarua o te whakawhiti hiko 2. Ki te tatau i te ia tuarua o te whakawhiti hiko 1, whakamahia ngā raraunga mō te whakawhiti hiko 1, pērā anō ki te tatau i te ngaohiko tuarua o te whakawhiti hiko 2, whakamahia ngā raraunga mō te whakawhiti hiko 2.
Te kaha o te au tuarua (I_s) whakawhiti hiko 1
V_p I_p =V_s I_s
(200)(3) = (300)(I)_s)
I_s = 600/300
I_s = K = 2 Āmpere
Ngaohiko tuarua (V_s) whakawhiti hiko 2
V_p I_p =V_s I_s
(40)(0,75) = V_s (1)
V_s = L = 30 Ngāohiko
Ko te whakautu tika ko B.

19. Kia aro ki ngā raraunga ine mō ētahi rahinga i roto i te whakawhiti hiko e whai ake nei!
I runga i ngā raraunga o te ripanga i runga ake nei, ko ngā uara o P me Q ko…
A. P = 100 Volts me Q = 4 Amperes
B. P = 100 Volts me Q = 6 Amperes
C. P = 110 Ngā Waohiko me Q = 4 Ngā Āmipere
D. P = 110 Ngā Waohiko me Q = 2 Āmpere
E. P = 220 Ngā Waohiko me Q = 2 Āmpere
Kōrero
Ngaohiko tuatahi (V_p)
V_s N_p = N_s V_p
(220)(300) = (600) V_p
(220)(3) = (6) V_p
660 = 6 V_p
V_p = 660/6
V_p = P = 110 Ngāohiko
Te kaha o te au tuatahi (I_p)
V_p I_p =V_s I_s
(110)(Au_p) = (220)(2)
(110)(Au_p) = 440
I_p = 440/110
I_p = Q = 4 Āmpere
Ko te whakautu tika ko C.

20. Kōrero mō ngā pātai ahupūngao SMA/MA UN – Transformers

1. Ko te hononga o te koiri tuatahi ki tētahi pūtake ngaohiko i roto i tētahi whakawhiti hiko tino pai, ā, ko tōna koiri tuarua ki tētahi rama e whakaaturia ana i te pikitia e whai ake nei. Ko tēhea te kōrero tika?

A. Ka memeha haere te mārama mēnā ka whakaitihia te takai tuatahi.

B. Ka mārama ake te rama mēnā ka tāpirihia te takai tuarua.

C. Ka memeha haere te rama mēnā ka whakanuia te ngaohiko tuatahi.

D. Ka mārama ake te rama mēnā ka whakaitihia te takai tuatahi.

E. Ka rite tonu te kanapa, te pōuri rānei o te mārama ahakoa kua whakarerekētia te koiri.

Kōrero

Ko te whakarerekētanga o te maha o ngā takahuri porowhita ka whakawhirinaki ki te momo whakawhiti hiko. Mēnā ka whakaitihia te maha o ngā takahuri i roto i te porowhita tuatahi, ka nui ake ngā takahuri i roto i te porowhita tuarua, ka huri te whakawhiti hiko hei whakawhiti hiko whakarunga, ka whakanui ake i te ngaohiko. Waihoki, ki te whakanuia te maha o ngā hurihanga i roto i te pōkai tuatahi kia iti iho ai te maha o ngā hurihanga i roto i te pōkai tuarua, ka huri tēnei whakawhiti hiko hei whakawhiti hiko whakaheke-iho e mahi ana hei whakaiti i te ngaohiko.

He mea nui kia maumahara, i te pikinga o te ngaohiko, ka heke te iahiko, nō reira ka noho pūmau tonu te mana (P = VI). Ko te mana te huringa o te pūngao hiko i roto i tētahi wā motuhake. Ina ōrite te mana whakauru ki te mana whakaputa, ka rite anō te nui o te pūngao e whakamahia ana.

Ko te kanapa, te pōuri rānei o te mārama, e whakawhirinaki ana ki te nui o te pūngao hiko e hurihia ana hei mārama. Mēnā he nui te pūngao hiko e hurihia ana hei mārama, ka kanapa te mārama; engari, ki te iti noa iho te mea e hurihia ana hei mārama, ka pōuri te mārama. Nā te mea ka tiakina te pūngao hiko, ka noho tonu te kanapa, te pōuri rānei o te mārama. 

Ko te whakautu tika ko E.

21. Kei te whakaahua i raro nei tētahi whakawhiti hiko tino pai. Kua honoa te koiri tuatahi ki tētahi pūtake hiko, ā, kua honoa te koiri tuarua ki tētahi rama (L). Kātahi ka...

A. Kanapa noa ina whakarerekētia te takai tuatahi

B. Ka memeha ina whakanuia te ngaohiko tuatahi

C. Ka kanapa ake mēnā ka tāpirihia te takai tuarua.

D. Whakaitihia te āhua mēnā ka tāpirihia te takai tuarua

E. Ka kanapa ake mēnā ka whakaitihia te takai tuatahi.

Kōrero

Mana tāuru = P = VI = (200 Volts)(2 Ampere) = 400 Watts = Mana putanga

Ka whakaitihia anake te ngaohiko e ngā whakawhiti hiko engari kāore e whakaitihia te mana. He ōrite te mana whakauru ki te mana whakaputa, nō reira he rite tonu te pūngao hiko e whakamahia ana i roto i tētahi wā kua whakaritea. Nō reira, ka noho noa te kanapa o te mārama, kāore rānei i rerekē.

Ko te whakautu tika ko A. 

Koinā katoa ngā kōrero mō ngā tauira pātai mō ngā whakawhiti hiko.

22. E hiahia ana tētahi tauira ki te 18 W o te mana AC. Ka hono ia i tētahi whakawhiti hiko me te pai o te 75% me te maha o ngā hurihanga o te 100 me te 200 ki tētahi pākahiko 12 V. Kāore i te kitea e ia te mana e hiahiatia ana. Ka kitea e ia ko te mana AC he...

A. 36 W nā te mea e hono ana i te 100 hurihanga ki te pākahiko.

B. 24 W nā te mea e hono ana i te 200 hurihanga ki te pākahiko

C. 12 W nā te mea e hono ana i te 200 hurihanga ki te pākahiko

D. 0 W nā te mea e hono ana i ngā koiri 200 ki te pākahiko.

E. 18 W nā te mea e hono ana i te 200 hurihanga ki te pākahiko

Kōrero

He taputapu te whakawhiti hiko hei whakanui, hei whakaiti rānei i te ngaohiko AC. Ko ngā pākahiko te pūtake o te ngaohiko DC.

Ko te whakautu tika ko D.

23. Kia aro ki te ripanga whakawhiti hiko e whai ake nei!

Ko te kōrero tika mō ngā whakawhiti P me Q ko…

He whakawhiti hiko whakaheke a A. P nā te mea ko Is < Ip

He whakawhiti hiko whakarunga a B. P nā te mea ko Vp < Vs

He whakawhiti hiko whakarunga a C. Q nā te mea ko Vp > Vs

He whakawhiti hiko whakarunga a D. Q nā te mea ko Is > Ip

Kōrero

He whakawhiti hiko whakarunga a P nā te mea ko te ngaohiko tuatahi (Vp = 110 V) < te ngaohiko tuarua (Vs = 200 V).

He whakawhiti hiko whakaheke a Q nā te mea ko te ngaohiko tuatahi (Vp = 220 V) he nui ake i te ngaohiko tuarua (Vs = 110 V).

Ko te whakautu tika ko B.

Pūtake pātai:

Ngā Pātai Whakamātautau Pūtaiao ā-Motu mō te Kura Tuarua/Kura Tuarua Ihirama

Ngā Pātai Ahupūngao Whakamātautau ā-Motu mō te Kura Tuarua/Kura Tuarua Mahi-ā-ringa

Ngā Pātai Ahupūngao SBMPTN